purge TS 1.1 support

at the time of release it will be almost five years since we introduced
TS 2.0 and stopped writing 1.1 by default, so there shouldn't be much of
a need to write such files any more - and this commit doesn't even
remove 1.1 reading capability (because it comes for free so far).

Change-Id: Ie54fe31f83733ef944306c01301c0ec0e9bcb8bf
Reviewed-by: hjk <hjk121@nokiamail.com>